RRAS - VPN Randomly Disconnecting

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http://serverfault.com – I am having a big problem with my VPN. The connection eventually disconnect. The max time i can stay connected is 48 h, but, sometimes it disconnect with only few hours. My VPN server is Microsoft Windows Server 2003 with RRAS. My VPN client is one TP-LINK WR-841ND router with DD-WRT firmware. This is my VPN server Interfaces for local network, internet and remote. This is one tracert to one device at the other side of the tunnel. Already try: Downgrade MTU to 1300. Buy new router and connect directly to my local network and VPN still disconnect. Confirm settings with http://su (HowTos)